And golders green, but there's more variation there, although traditionally they've supported the Conservatives, like the wider Jewish community. However, recently more ultra-orthodox have been voting Labour. With the obvious exception of Ken Livingstone.
Yes, it's interesting in that there's actual anti-Semitism and widespread anti-Israel sentiment in the British left, while in the U.S., it's almost completely marginalized.
Because the British left consists mostly of class lines. There are plenty of American "rightists" who would be staunch "leftists" in Britain (read: Republicans, Labourites), and the reverse is also true. The US's left-right economic divides, where it has them (rarely) tend to be along racial lines. And many of those American Republicans who would be British Labourites harbor some pretty strong anti-Semitic views. Of course, even that is mitigated by the very American view that Israel is basically a satellite state of the US.